Tohatsu
Outboard
Propeller
Chart
Propellers
have two basic
dimensions;
diameter &
pitch.
Diameter is
the distance
measured
across the
propeller hub
line from the
outer edge of
the circle
that is made
by the
propeller's
blades during
rotation.
Pitch is the
distance that
a boat will
travel if
rotated one
revolution
without any
slippage. When
describing a
propeller both
the diameter
and pitch are
given. The
diameter is
referenced
first and the
pitch is
second.
Therefore, a
12" x 9"
propeller
would have a
12-inch
diameter and a
9-inch blade
pitch.
Theoretically,
a propeller
with a 14-inch
pitch, when
rotated one
full turn,
would advance
a boat 14
inches through
the water. In
reality, no
14-inch pitch
blade will
advance a boat
14 inches with
one full turn.
This variance
is referred to
as slippage.
In general,
changing to a
higher pitch
prop will
increase your
top-end speed
but reduce
your
acceleration
(reduce your
"hole-shot"
power). On the
other hand,
decreasing the
pitch will
increase your
hole-shot but
sacrifice some
of your
top-end speed.
If the
hole-shot
speed is
important to
you, for
example if you
pull water
skiers most of
the time, then
you would want
to go with a
lower pitch
prop and
sacrifice some
of your
top-end speed
but increase
your hole-shot
speed to get
the skiers up
faster.
UNDER NO
CIRCUMSTANCES
SHOULD YOU
EVER USE A
PROP WHICH
WILL ALLOW
YOUR OUTBOARD
TO OPERATE
ABOVE THE
OUTBOARD'S
RECOMMENDED
MAXIMUM RPM's!
The propeller
selection
chart can be
used to help
you in
selecting the
correct
propeller for
your Tohatsu
outboard.
Remember that
in any
application,
discrepancies
in performance
can result due
to the
different boat
hull designs,
the final
carrying load
and your
particular
needs.
NOTE:
It is highly
recommended
that the
outboard be
checked with a
tachometer to
ensure that
the engine is
operating
within the
correct
MAXIMUM RPM
RANGE.

The
selection
of the
correct
propeller
will
allow
the
engine
to
obtain
it's
full RPM
as well
as the
designated
horsepower.
Engine
horsepower
is very
closely
related
to the
RPM that
the
outboard
can
obtain.
In other
words,
if the
outboard
can not
reach
its
specified
RPM, it
cannot
reach
its
specified
horsepower.

We hope
that
this
selection
chart
helps
you in
making
the
right
decision
when
choosing
a
propeller
for your
Tohatsu
outboard.